i changed my lambda sensor and mass airflow sensor and still my zafira 1800 petrol runs bad when cold and cant clear engine management fault also my heating inside my car is not as hot as before i changed my rad and thermostat/housing helpi changed my lambda sensor and mass airflow sensor and still my zafira 1800 petrol runs bad when cold and cant clear engine management fault also my heating inside my car is not as hot as before i changed my rad and thermostat/housing help

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I guess you have no knowledge what so ever, about
OBD vehicles systems or check lights

They have been on all vehicles for 31 years

Check for codes -- in a couple of days
Diagnose the system with the malfunction --- couple more days
Make repair or stop using the vehicle --one week -- start to finish,once
you get any type of dash light on

if u have one oxygen sensor then u need to take a deep look at the bottom of ur car it will be somewhere at the Exhaust pipe
if u have a catalytic converter then u will have two oxygen sensors one before the catalytic converter & the other will be after the catalytic converter.
Note: the catalytic converter is located at after a little bit of beginning in Exhaust pipe.